js Json usage

1. var packJson = [{"name":"Liza", "password":"123"}, {"name":"Mike", "password":"456"}]; 
   
1. 1 traversing JSON object code as follows:
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   1. var packJson  = {"name":"Liza", "password":"123"} ;  
   2.   
   3. for ( var  K  in  packJson) { Each key object // iterate packJson / value pair of, k is the key  
   4.    alert(k + " " + packJson[k]);  
   5. }  
   2, traversing JSON array code is as follows:
    
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   1. var packJson = [{"name":"Liza", "password":"123"}, {"name":"Mike", "password":"456"}];  
   2.   
   3. for ( var  I  in  packJson) { // when traversing packJson array, i is the index  
   4.    alert(packJson[i].name + " " + packJson[i].password);  
   5. }  

  ajax(url, function (resText) {
                console.log(resText);
                var obj = JSON.parse(resText);
                for (var i in obj) {
                    console.log(obj[i].UserName);
                }
            });